+1-415-315-9853

info@mywordsolution.com

## Statistics

1.

a. find out μ and σ for the following set of scores and then convert each score to a z  score:  64, 45, 58, 51, 53, 60, 52, 49.
b. find out the mean and standard deviation of these z scores.  Did you obtain the values you expected?  describe.

2. Find the area of the normal distribution between the mean and z, when z equals

a. .18
b. .5
c. .88
d. 1.25
e. 2.11

3. Assume that the resting heart rate in humans is normally distributed with μ = 72 bpm (i.e.,beats per minute) and σ = 8 bpm.

a. What proportion of the population has resting heart rates above 82 bpm?  Above 70 bpm?
b. What proportion of the population has resting heart rates below 75 bpm?  Below 50 bpm?
c. What proportion of the population has resting heart rates between 80 and 85 bpm?  Between 60 and 70 bpm?  Between 55 and 75 bpm?

4.

a. If alpha were set to the unusual value of .08, what would be the magnitude of the critical z for a one-tailed test?  What would be the values for a two-tailed test?
b. Find the one- and two-tailed critical z values for α = .03
c. Find one- and two-tailed z values for α = .007.

5. Assume that a large statistics class has just taken an exam with 300 multiple-choice problems. The distribution of grades was normal with a mean of 195 and a standard deviation of 30.

a. What two values of X (number of problems answered correctly) would encompass the middle 50% of the results?
b. 75% of the grades would be less than_____.
c.    95% of the grades would be between______and______.

6. Suppose that neighborhood soccer players are selling raffle tickets for \$500 worth of groceries at a local store, and you bought a \$1 ticket for yourself and one for your mother.  The children eventually sold 1,000 tickets.

a. What is the probability that you will win?
b. What is the probability that your mother will win?
c. What is the probability that you or your mother will win?

7. Using the following table, please find out the risk, risk ratio, odds, and odds ratio of receiving the death penalty if you are White vs. if you are non-White:

Defendant’s Race    Yes    No    Total
White                      20    130    150
Non-White             100    450    550
Total                      120    580    700

8. In the last few years, an organization has conducted 200 clinical trials to test the effectiveness of anti-anxiety drugs.  Suppose, however, that all of those drugs were obtained from the same fraudulent supplier, which was later revealed to have been sending only inert substances (e.g., distilled water, sugar pills) instead of real drugs.  If alpha = .05 was used for all hypothesis tests, how many of these 200 experiments would you expect to yield significant results?  How many Type I errors would you expect?  How many Type II errors would you expect?

9. Using the data we collected, go to Analyze> Descriptive Statistics > Descriptives.  Put in the Variables box “fb”.  Click on the box that says “Save standardized values as variables.”  This will give you all the z-scores.  In the options box, click on mean and standard deviation.  Click continue, then Paste and Run.  The output should be a box with the means and standard deviations, and the Data will have a new column labeled Zfb.  These are your z-scores.

10. Assume that number of facebook friends is normally distributed. Using the z-scores you find outd using SPSS and the table of probabilities for the standard normal distribution (Table E.10), answer the following problems:

a. What proportion of participants has more facebook friends than Subject #160?
b. What proportion of the participants have less facebook friends than Subject #118?
c. What proportion of the participants have between Subjects #2 and #3’s amount of facebook friends?
d. What number of facebook friends would put you in the top 10%?
e. What number of facebook friends would put you in the bottom 5% (of those who use facebook)?

11. We are interested in whether our friends and family have more facebook friends than does the general population of Americans, which is known to be 120.

a. What is the null hypothesis (words and symbols)?
b. What is the alternative hypothesis (words and symbols)?
c. Using SPSS, show graphically the distribution of facebook friends from your sample.  Describe this distribution.
d. What is the mean number of facebook friends (use SPSS)?
e. What is the standard deviation (use SPSS)?
f. What is the standard error?
g. Pretend instead that the mean and standard deviation you obtained had come from a sample of 100 of our friends and family.  What would happen to the standard error?  What if the sample came from 10 of our friends and family?
h. Would you use a one- or two-tailed test to test your hypothesis?  Provide an argument in favor of both options.

Statistics and Probability, Statistics

• Category:- Statistics and Probability
• Reference No.:- M91837
• Price:- \$125

Guranteed 48 Hours Delivery, In Price:- \$125

Have any Question?

## Related Questions in Statistics and Probability

### Describe the technologies that contributed to the

Describe the technologies that contributed to the development and advancement of the newspaper from small, infrequent circulations of a few brief pages to the mass production of daily, extensive pages of news.

### The following tables depict the preferences of three

The following tables depict the preferences of three universities regarding a set of applicants, and the preferences of the applicants regarding the universities. Every university also has a specified quota for the numbe ...

### Assume that womens heights are normally distributed with a

Assume that women's heights are normally distributed with a mean given by mu equals 63.3 in, and a standard deviation given by sigma equals 3.1 in. Complete parts a and b. a. If 1 woman is randomly selected, find the pro ...

### 1 a study was conducted at a local college to analyze the

1. A study was conducted at a local college to analyze the average GPA of students graduated from Arizona State in 2012. 100 students graduated from Arizona in 2012 were randomly selected,and the average GPA for the grou ...

### If 2 of the calls received by schools switchboard are wrong

If 2% of the calls received by schools switchboard are wrong numbers. Find the probability that among 210 calls received by schools switchboard, 4 will be wrong numbers. a). Determine in this case whether the conditions ...

### Find alice and bobs common key k by using the

Find Alice and Bob's common key K by using the Diffle-Hellman-Markle key exchange scheme with the given values of M,n,a and b. M | n | a | b 17 | 7 | 6 | 7 Alice and Bob's common key K is this is a cryptography chart.

### Assignment quantitative methodsquestion 1 a large shipping

ASSIGNMENT: QUANTITATIVE METHODS QUESTION 1: A large shipping company recorded the tonnage shipped weekly across the pacific for 50 weeks. The data is presented in the table below. 530 492 462 379 487 523 600 618 548 431 ...

### Objectivenbspstudents will assume the identity of a person

Objective:  Students will assume the identity of a person living in the north or south during the Civil War and provide a personal experience in the form of a letter. Most of what we know of history prior to technologica ...

### Three different brands of pain relief medication are

Three different brands of pain relief medication are available for minor aches and pains. It is of interest to know whether the mean time to relieve the pain differs from brand to brand. To find out, twelve individuals w ...

### In january 2011 the average monthly rental rate for

In January 2011, the average monthly rental rate for one-bedroom apartments in a certain city was \$783. Suppose rental rates across all one-bedroom apartments in this city follow approximately a normal distribution, with ...

• 13,132 Experts

## Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

### Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

### Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

### Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

### Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

### Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen